Photonic phase shifters based on a vector-sum technique with polarization-maintaining fibers

Abstract

We propose and demonstrate a photonic phase shifter based a on vector-sum technique that uses polarization-maintaining fibers (PMFs). We achieved a continuous and full phase shift up to 2pi at 30.48 GHz by controlling the polarization state of the light injected into two pieces of PMF of different lengths and applying two different modulator bias voltages.

Integrated Microwave Photonics for Wideband Signal Processing

“…Phase shifters based on the use of various discrete photonic components such as 2D liquid crystal on silicon [12], stimulated Brillouin scattering (SBS) effect in optical fibers [13], vector sum [14], optical filters [15], semiconductor optical amplifiers [16], fiber Bragg gratings (FBGs) [17], and electro-optic modulators [18][19][20], have been demonstrated.…”

Programmable RF photonic phase shifters based on FD-OP for optically controlled beamforming

“…In recent years, various methods for microwave photonic phase shifter have been proposed, for example, based on true-time-delay elements [4][5][6], homodyne mixing techniques [7,8], vector sum techniques [9,10], and nonlinear effects [11][12][13]. It is difficult for the others techniques [7,[9][10][11][12] to operate multiple independent phase shifters, and so the optically controlled beam forming system is complex.…”

“…It is difficult for the others techniques [7,[9][10][11][12] to operate multiple independent phase shifters, and so the optically controlled beam forming system is complex. Recently, Fourier-domain optical processor (FD-OP) is extensively applied in microwave photonic filter [14], photonic microwave phase shifters [15] and true-time-delay beam forming [16].…”

Broadband Microwave Photonic Splitter With Arbitrary Amplitude Ratio and Phase Shift

“…After photodetection, microwave signal with full 360 phase shift is achieved. In other literatures, microwave photonic phase shifters have been demonstrated based on slow light in semiconductor amplifier (SOA) [9], vector sum technique [10], 2-D array of liquid crystal on silicon pixels [11], wavelength conversion in semiconductor laser [12], polarization modulator (PolM) [13] or dual-parallel Mach-Zehnder modulator (DPMZM) [14]. The previously reported microwave photonic phase shifters can realize phase shift of the microwave signal with fixed amplitude [7]- [14].…”